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Living with Maternal hyperthermia induced birth defects

Birth differences linked to a high body temperature in the mother during pregnancy.

Understanding Maternal hyperthermia induced birth defects

Maternal hyperthermia induced birth defects are developmental differences in a baby linked to raised body temperature of the mother during pregnancy.

The raised temperature may come from a fever or a hot environment. Reported differences include neural tube defects, heart defects, a cleft lip or palate, eye differences, and other minor ones. GARD says experts have not reached agreement on the cause-effect link. It starts in pregnancy and the newborn period.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Small head (microcephaly)
  • Cleft palate
  • Small or missing eyes
  • Slow growth before birth
  • Seizures
  • Low muscle tone and joint stiffness

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include ear, nose, and throat specialists and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    World Craniofacial Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Ear, nose, and throat specialists (otolaryngologists); Genetic specialists (geneticists)
Expert care
Expert lists: World Craniofacial Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with World Craniofacial Foundation and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
How were my child's differences linked to the pregnancy temperature?
Which specialists should follow my child's development?
Is any genetic testing helpful?

Quick facts

Symptoms usually startduring Pregnancy and as a Newborn

The record describes it as linked to raised maternal body temperature from fever or heat exposure. GARD says experts have not agreed on the cause-effect link.

Genetic

Also known as: birth defect due to maternal hyperthermia; maternal hyperthermia induced birth defect; maternal hyperthermia-induced birth defects

Patient organizations

Source: NIH GARD · Maternal hyperthermia induced birth defectsGARD ID 2856 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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